The Guardian --
Trump talks ‘complete nonsense’ about crime in London, says Met police commissioner – UK politics live
It really isn't normal for heads of government or state to start complaining about how the capital cities of other countries are run, and particularly not for them simply to repeat nonsense they've seen on social media and for the chief of police of the city in question to have to tell them it's all rubbish.
London -- electing left of centre social democratic Muslim mayors before it was cool.
The bit about sharia courts is an ancient red herring -- like Jewish rabbinical courts (Beth Din) they are community religious tribunals dealing with religious questions and some civil matters, including divorce, marriage and inheritance. Participation is voluntary and their rulings don't have any legal force. They're a form of voluntary arbitration, in other words. If a Muslim couple want a divorce, they still need to ask the regular civil courts for one. If they also want the marriage dissolved in the eyes of their religious community, they have to ask a Sharia court to do that.
They can't, though, override a civil court's decision -- if a Muslim wants to dispute their late relative's will because it's contrary to Islamic inheritance law, or their former spouse's offer of family support because it's contrary to Islamic family law, then it's their choice whether they take the matter to a sharia or civil court to decide, but the sharia court's judgment will not normally have any legal force unless it's part of a previously-agreed arbitration process, and even then it wouldn't be enforceable if it's incompatible with regular UK civil law.
Voluntary arbitration procedures like this may or may not be desirable, but British civil courts will always encourage litigants in civil matters to reach a mutually acceptable settlement rather than go through the expensive process of asking a civil court to decide what the civil law says is the default settlement without reference to any particular circumstances of the case, and with which none of the parties may be satisfied. The civil courts don't address the question of whether someone *should* have cut their relatives out of the will and left the bulk of their estate to a trust set up to care for their pet cats, only whether the law permitted them so to do.